another important thing to remember is that you are sort of limited in the cable run you are allowed with actives. If you want to suspend your mics and snake the cables around a rafter back to the rest of your rig, you'll need the extra gear. Tim is absolutely right, you should really evaluate what the little cash you'll get selling the hardware vs. having the stuff around when you may need it. If it sets around for a year and you don't ever use it, then dump it off. But for now, I would hang on to it.
I made the mistake of selling off some stuff that regret. Now I have to borrow stuff for certain occasions and its fine, but definately not ideal. You never know when you'll need something.